Four people were shot to death on Sunday in a suspected robbery at a Long Island drug store, police said.

Suffolk County homicide detectives found four people shot dead at Haven Drugs in Medford, about 60 miles east of New York City, at mid-morning after getting a 911 emergency call that was placed from the store's parking lot.

Police said two of the victims were believed to be store employees and two others customers, and that robbery was the likely motive.

All four were dead at the scene. Other details on the victims were not immediately available.

Police said they had not identified a suspect but said they were looking for a lone shooter and continuing their investigation.